Single Active Switch Hybrid Dual Diode-Capacitor Boost Converter With Reduced Voltage Stress for High Voltage Gain Applications

In this paper, a single-switch hybrid dual diode-capacitor (HDDC) boost converter with less stress over all devices for high voltage gain applications is proposed. It combines a voltage boost cell with two back-to-back diode-capacitor cells for providing high voltage gain. The current spikes across the switching devices, occurring due to the diode-capacitor circuit, are effectively truncated by an inductor that is used at the input side. With a single inductor and a single MOSFET, the proposed HDDC converter provides continuous input current, a common ground (C.g) structure and keeps the device voltage stress (V\(_\textrm{stress}\)) and current stress under check. This allows the use of lower-rating devices and is helpful in restricting switching losses, thus improving the comprehensive efficiency of the converter. For integrating RES with micro-grid, the proposed HDDC converter provides all the desirable features. A MATLAB/Simulink model is employed for testing purposes of the proposed HDDC. Additionally, a hardware prototype of the HDDC, with a power rating of 280 W and voltage output of 200 V, is subjected to laboratory testing at a frequency of 33 kHz. The findings from both the simulation and hardware testing are then compared to validate the performance of the proposed HDDC. At near-rated load, the converter operates at an efficiency of around 95.4%.